suEXEC: Fix backport r1070639 which breaks compilation for platforms which do

not support suexec. The patch also avoids printing the useless suexec path.     

Submitted by: fuankg
Reviewed  by: rpluem, trawick


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1076611 13f79535-47bb-0310-9956-ffa450edef68